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excitation has 6 distinct synonyms spread across 3 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the state of being emotionally aroused and worked up
“his face was flushed with excitement and his hands trembled”
the neural or electrical arousal of an organ or muscle or gland
something that agitates and arouses
“he looked forward to the excitements of the day”
Synonyms, antonyms and the broader and narrower relations for excitation come from Princeton University’s WordNet. Full sources and licences.